Telephone-exchange system.



J. L. MUQUARRIE. TELEPHONE EXCHANGE SYSTEM. APPLIOATION FILED $122115,190m 923,993. Patented June 8, 1909.

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to the e TEL}? TLLINOIS, ASSIGNUH Tl} W ESTERN ELECTRIC- COZvEL'PAll?!OF CHICAGO, ILLINOIS,A'CORPORATXON OF ILLINOIS.

Specification of Letters Patent.

Patented June Ti 96% Application filed September 15, 1908. fierial 1'30.33%,?92.

(1Z5 av/ion: it may concern: tie it known that .1, JAMES L.

'it en of'tlxe United States, residing at Gel;

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( l-"mlz, in the county of'Cook and State of .llwoix, have invented acertain new and ems m" wlneh the following is a. full,

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change system, and has for its ob; vot to pro Vlll an opev "s key boardequipment of l0 and elnoient oluuaetei'.

o intention, eontempleteean el'z'angel ne-fit of circuits and apparatusin association with the operatofis cord or connecting eir eviwl'iez'eljy the listening key of one cold (It t 5, when depressed,efieetsthe eonnee tion of the operators telephone in looking oiroui'twith such cord circuit, and also brings about the olosure of a lockingeig'euit for a Sign" eeeoe'iatel with such cord eii'euit, 2 l ioh servesan indication to the operator that her telephone set has beeneoiimeateal a irtie'ulor 10rd circuit (l-coiled, t l lien ope-mt 2*,all? desires to connect lzer telephone 1 set to l of smell otherfifilfl, eireuit, Whez-euoon t T g e'lreiiit of the signal of "the lustr 0011i eii'enit broken and the a" Sltlll otliev cord circuitdie-played, :1. set being at the same time it eueli other i eomoiion keyis priiivided 1e operator to rliseonneet her 7"" any cord CllQUlliand12:11 when clelo connection my ii'vv'ez'ition more we to the eeeompnn*pieseut (liegjremm:ttieu-lly h s telepl one lines and e pair eiiteu tsfor etl'oetiieg the intercom .neetion 01 each lines.

From the link conductors 1- 2, irc'uit I, av pair of one through the'e'rmetui'es open front eontel, 1 of ielay 7 to 'eiors telephone wt 3 Te relay 7' lilOi d the o omtofis lir meg lie ieliis provided with aemlialei spring; 10 eomaeetelwit'h conductor 11 extending to of eon!motors 3, 4, lead and their 11()'l'- eg it .z":u gl2 the Winding ofrelay '5', the em 5 10 being edegsted when de Al. 1' mpi'mrement inTelephonelixehmige ti(m"1' le,tes to a telephone ex having listened inon said 21 tzonlgirouit, she operates the,

cent at springs 10, i2, QUDQPL- :2 vii amt lmgly eom 'ileted for theKOll-lj, 7

including battery 14:, which thereupon eonnests at its armature-1 5 6,mill ,ll' front contests, the telephone set witn the vow lllifltlllgcircuit 1.

A signal. i6 assoeiaited with the eom meeting 2 cord circuit l adoptedw! d played to indicate to the oim'atoi i t he! telephone llitS beenconnected z the (10rd circuit 1. The signal 16, 'Wl'llGll preferably anineantleseent lamp, included in a conductor 17 extending from thearmature 18 of relay 7 through the contacts 19 20, of a common key 21,through the normally connected springs 12, 35, of the operators lie 3 oflink conductor to the contact sp ing 15 of the opemiore l; v 9 of cordeircult .1, sand 51) mg 15 being normally eon-- nee'tecl through spring112 and conductor with the freepole of grounded lm'ttery 2-? The frontoonteet of ermatui" e 18 of relay 1 to eonduetox" l 1 between relay and.spring 1 t.

It will be seen that when the spring 39 of the operators key 9115depressed into engage ment with spring l2, e momentary or initialcireuit emiipleted for relay 7 from the free pole of grounded better 1%,eonduetor l3, px ings 12, 10, of the listening key com dilator ll, toearth through the wii'iering o! relay 7. The relay 7 tlleiei's. 1a'ttmets it QTIEHti-IHGS 5, S and 18, the lane-til i. Q, U eoim ileiingthe continuity of eoiiduetois 3, 4 to connect the telephone with thelink comm-tors l, 2, of the eonneeting e1" cord oil-unit l, and thearmature 18 of relay 7, when key 9 is restored to normal condition,(-ompleting a looking eireuit for relay '2 and the lamp 16 from the freepole of groumt ed better? I' l, conductor 13, content springs 12, 15, ofkey S of" cord eircuit l; iln'm fltlu springs 12, 15, olke 9 of eol'dcircuit 1 l, through common key 23 signal litlllj') a t cord circuit 1,eonducte; 22 to earth tlu'ougli the Winding o'l rela y for each circuit,means associated with one ,ol' said connecting circuits for connectingthe and relays 7, so that the operator wishes to connect her telephoneset to cord circuit l l, she operates key 9 of such cord circuit, andthe springs 10 thereof in its depression separatescontact springs l2,]5, to open the locking circuit l3-17-227 of the signal lamp ll) andrelay 7 of cord circuit 1, and the operation of associating the telephone set S with cord circuit I l and efl'ectin the display of the thecircuit of the telephone set, and means lor closing'the circuitof saidsignal and thus displaying the same during the interval said telephoneset is connected with said connccting circuit. 7

2. The combination with a connecting circuit, of a telephone set, asignal associated with said circuit, a key adapted when niomcntarilydepressed to connect said telephone set in a locked circuit with saidconncct-ii'ig circuit, and alocking circuit for said sicnal alsocontrolled by said key.

3. 'lliecombination with a, connecting circuit, of a tclephonc set, arelay adapted to connect said telephone set with said connectingcircuit,a signal associated with said con- ('(llllfl circuit adapted to bedisplayed by said relay when energized, a key associated with saidconnccting circuit adapted when momentarily aprcsscd to complete acircuit for said relay, and a locking circuit for said relay completedby itself when energized.

4. The combination with a number of conncctin t circuits, of anoperators telephone set adapted to be connected with any one of saidconnecting circuits, a separate signal for each connecting circuit, andmeans for displaying the ignal of any connecting circuit onl'ywluringthe interval the telephone set is connected thereto.

The combination with a number of connccting circuits, of a telephoneset, a signal telephone set therewith and e'll'ccting the displa of thesignal of such connecting circuit,

an meansat each of the other connecting circuits for transferring thetelephone set into connection with such other cord circuit, and 'l'orcllacing the signal of the lirst mentioned connecting circuitanddisplaying the signal cl such other cord circuit.

6, 'lhecombination with a connecting circuit, of a telephone set, a keyadapted to con- ,ncct said telephone sot with the connecting with saidconnectkey for said connecting circuit adapted to connect said telephoneset with said connecting circuit and cause the display of said signal, asecond connecting circuit, a signal therefor, and a key associated withsaid second connecting circuit adapted to transfer the connection of thetelephone set to said second connecting circuit, and to el circuit, asignal associated mg circuit, it

mentioned connecting circuit and the display of the signal of the secondconnecting circuit.

" The combination with a pair of connectl l l g l l l l I ing circuits,of a telephone set, a key at each connecting circuit for connecting thetelc phone set thereto, a signal for each connect ing circuit, a lockingcircuit for the signal of each connecting circuit closed upon theoperation of the key at such connecting circuit, 1 and means controlledby each key for opening the locking circuit of the signal of the otherconnecting circuit in completing the circuit of the signal of its ownconnecting circuit.

S. The combination with a connecting circuit, of a telephone set, arelay adapted to connect said telephone set with the conn'cc ingcircuit, a signal associated with said connecting circuit, a lockingcircuit for said signal com lctcd by said relay when energized,

a key at aptcd to complete a circuit for said relay, a second connectingcircuit, a signal and controlling relay therefor, and a key associatcdwith said second connecting circuit adapted when opcrated to open theaforesaid locking circuit and complete a circuit for the relay of thesecond connecting circuit.

'lhe combination with a connecting circuit, of a telephone set, a relayadapted to connect said telephone set with the connecting circuit, asignal associated withsaid connecting circuit, a locking circuit forsaid signal and relay completed by the relay when encrgizcd, anoperators key adapted when momentaril depressed to complete an ini tialcircuit for said relay, :1 second connecting circuit, a relay associatedwith said circuit adapted to connect the telephone set therewith, a.signal for said connecting circuit controlled by said relay, and a keyassociated with said connecting circuit adapted when operated to openthe aforesaid locking circuit and complete a circuit for the relay ofsaid second connecting circuit 10. The combination with a number ofconnecting circuits, of 'a telephone set, a signal associated with eachconnecting circuit, a key for each connecting circuit adapted to connectthe telephone set in locking circuit with said connecting circuit andcomplete a locking circuit for the signal of such connccl ing circuit,each key when operated opening the locking circuits of the otherconnecting circuits, and a common key controlling all looking circuits.

,fect the retirement of the signal of said first lllS lilll 11. Thecombination with a number of circuit for the relay of the secondconnecting cord circuits, of a telephone set, means associated with oneof said cord circuits for connecting the telephone set therewith andmeans at each of the other cord circuits for disconnecting the telephoneset from said first mentioned connecting circuit and transferring thetelephone. set into connection with said other cord circuit.

12. T he combination with a connecting circuit, of a telephone set, arelay adapted to connectsaid telephone set with the connect ing circuit,clocking circuit completed by said rela; when energized, a key adaptedto complete a circuit for said relay, 1 second .connecting circuit, anda key associated with said circuit adapted when operated to open theaforesaid locking circuit and complete a l i i l l l l circuit.

13. The combination with a plurality of connecting circuits, of :1telephone set, at key associated with. each of se id connectingcircnits, and means controlled by the operation of each of said keys for20l1ll(Ui-i11,f f said telephone set with the connecting circuitassociitted with the operated key and for disconnecting said telephonesci from any other of said connecting; circuits.

In witness whereof, I, hereunto subscribe my nnnie this 13th day ofSeptember A. ll,

JAIXIES L. McQfU: ERIE. Witnesses:

Gnoncn E FOLK,

Aiirnnn H. Mooim

